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1st Int. Transborder Conf. of the Timor Island: Timor %u2013 Science without borderDili, 7-8 May 202599Teaching At The Right Level To Improve Higher Order Thinking Skills (HOTS) of Mathematics Education Students In Calculus Siprianus S. Garak* and Imelda H. Eku RimoDeptartment of Mathematics, Faculty of Education and Teacher Training, Universitas Nusa Cendana, Indonesia.*Corresponding author: siprianusgarak@gmail.comAbstractThis study aimed to improve the Higher Order Thinking Skills (HOTS) of mathematics education students at Nusa Cendana University in the topic of Integral Calculus through Teaching at the Right Level (TaRL) approach. This research was a continuation of a previous study on the HOTS profile of mathematics education students in relation to Calculus, which revealed that mathematics students at the Faculty of Teacher Training and Education (FKIP) of Nusa Cendana University (Undana) have not yet achieved a HOTS level. The research method used in this study was Classroom Action Research. The study was conducted in one of the Integral Calculus II course classes. The results showed that implementation of the TaRL approach in Integral Calculus material improved HOTS of the mathematics education students at FKIP Undana. This improvement was evidenced by the final test results of each cycle, which showed that more than 75% of students have HOTS in the \C4 to C6. In general, students were able to distinguish between different forms of integrals and apply appropriate methods in problem-solving. Furthermore, students were able to effectively solve problems involving various types of integral models.Keywords: Teaching at the Right Level, Higher Order Thinking Skills, Vector Space.